I assume you mean a database of listings. Only way I know of is to use File Exchange (FE) other than coding your own solution and using the eBay APIs. Online listing services such as Sixbit and others may offer some functionality along those lines - I leave it to you to research that.
There is no simple FE step by step - it will be a fairly complex undertaking with a step learning curve. You will have to export the database data to CSV in an appropriate format and configuration for FE, and use eBay FE functionality to upload the listings. Photos have to be hosted online somewhere to be included when using FE for listing upload from what I understand.
You would do better to post this request in the
https://community.ebay.com/t5/Tools-Apps/bd-p/tools-apps-db forum where dollybeauty and mykal@ebay can help with specifics.
https://pages.ebay.com/file_exchange/SMP_faq.html?id=0